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Plant and Cell Physiology, 1982, Vol. 23, No. 8 1329-1336
© 1982

Article

IAA Transport and Georeaction in the Flower Stalk of a Poppy, Papaver Rhoeas L.

Jiro Kohji1, Hirohumi Hagimoto2, Ryoichi Yamamoto2 and Yoshio Masuda2

1Naruto High School Naruto City, Tokushima 772, Japan
2Department of Biology, Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558, Japan

The straightening process in the georeaction of the flower stalk (peduncle) of a poppy, Papaver Rhoeas L., was studied in relation to IAA transport in the peduncle and the receptacle. After the peduncle had been formed, it first nodded. Cutting the flower bud off at the nodding stage (stage 3–4 if the development is divided into 12 stages) caused rapid straightening of the nodding peduncle but the curvature was maintained if IAA was applied to the cut end of the decapitated peduncle. Application of 2,3,5-triiodobenzoic acid to the upper part of the peduncle just below the flower bud at various growth stages caused immediate straightening of the nodding peduncle. The IAA content in the peduncle was lower at the straightening stages than at the nodding stage. Transport of 14C-IAA through the receptacle was less at the straightening stages than at the nodding stage, while that through the peduncle was the same at these stages. These results led to the conclusion that the straightening process of the poppy peduncle, which is considered to be a negative geotropic response, is controlled by a decrease in the basipital transport of IAA from the flower bud to the peduncle through the receptacle.

(Received April 12, 1982; Accepted September 13, 1982)
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